Felipe Massa says he doesn't expect to see a big difference in the hierarchy of the teams in the Spanish Grand Prix as several outfits get ready to introduce upgrade packages.

The first European round of the season is traditionally used as a chance by teams to bring new parts and ideas to the cars, and Williams is no exception, with Massa saying the team has been working on aerodynamics to get more downforce on the FW37.

However, though Massa is eager to bridge the gap to Mercedes and Ferrari in front, he doesn't expect the changes to ultimately alter the running order at the top.

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"We will try everything we can," he said. "Many teams are working to have new parts in the car, like we have, but we don't know how much more or less we have compared to the other teams. I don't think things will change completely, but I hope we can have a good weekend."

Massa is currently fifth in the overall standings with a best result of fourth place from the Australian Grand Prix.